That flag is actually set on Vicky's route! However, it's not the only way to progress on Rye's path; a high INT will see you through just as well.
Good morning, I bought this game but I can't play it, it crashes and both the antivirus and the Windows operating system recognize it as an invasive and dangerous file, in fact I had a lot of trouble deleting it, so the game works but are there problems due to the bugs you mentioned? Or have I just wasted my money?!